Imitation stone



Jan/10, 1939. H. '1. NIRENSTEHN 2,143,084

IMITATION STONE Filed Maich 15, 1957 INVENTQR. ZZZ/s f .M/PENSTE/M -5 Amh p ipal objects which the present numeral H and the third part, as thestem she11,'2 5

do d method in the m re and s m y of tion at the upper widest partthereof next thelO .15 a one-piece C n t u ti n; t ur simplicity of stemshell to be the same where those parts meetfi Patented Jan. 10, 1939 I2,143,084

-UNITED STATES PATENT OFFME IMITATION STONE Harris I. Nirenstein, NewYork, N. Y.

Application March 15, 1937, Serial No. 131,005

1 Claim. (01. 63-32) This invention relates to improvements in imisaidparts interfitted to form the completed artation gems and/or preciousstones. ticle. One of said three parts, as the mid-body Objects portion,is indicated by the reference numeral Ill, the second part, as thereflector portion, by the invention has in view arer-to be enabled to byt numeral 2 The body pgrfion m prefan t imitation gems to s y Simulateerably provides the face or exposed portion of t genuine article; to eenabled to manufacthe gem and the usual stem portion 13 extending u eimitation gems ap y; utilize a downwardly from the top thereof. Saidstem por- D provide means for aiding in giving briltop or face of thegem preferably is of less diama ce t0 t fi s to utilize mea s for eterthan the face, as at l, to accommodate the assembling the Co p te p s dapp y he thickness of the reflector portion H and stem et vwhereby theparts Will be r e irltO shell l2 to enable the diameters of the face andconstruction and operation in the manufacture In carrying out theinvention the face or top and method of making the gems; a Obtainportion In with the setting or stem portion l3 Other adva a es a d esuls m y b bro and the set-in portion I4 preferably may be suitout in thefollowing description. ably formed with the usual facets, as by die cut-Drawing ting, and then made fast with respect to thei reflector member Hand stem shell 12 by any Figure 1 is a sectional View of a mold havingsuitable method. One such method is shown in a die for shaping acomposite part and consisting Figures 1 to 3 ihchlsive, in which I haveshown of the first step incu r ng u the lrlethodi a mold l5 having aconically shaped depression I6 u e 2 IS a Slmllar V a d ShOWmg the inthe top thereof. Said depression I6 is pro- 5 0nd step of the met od;vided with internal facets I? and is adapted to Figure 3 iS a SimilarView and Showing the final receive molten glass therein, whereby whenheat step of the method and the composite parts comis apphed to t m 1;proper temperature p y a d; the glass on its exterior surface will besuitably Figure 4 is a View of the finished gem Showing shaped andfaceted. The initial step of the 30 one-half thereof in elevation andthe other half method may t he refer ed to as the introducin Secti tionof or production of molten glass in the mold. Figure 5 is a sectionalview Of one Of the parts The reflecto m ember II before being applied Cp t y p to the hot molten glass is first preshaped and Figure 6 is p p VOf the Same; and preferably to correspond to the shape of the 35 Figure7 S a m d fied Cons ru Of the gem faceted mold depression and can bepositioned S ow the Sa p y broken ywithin the depression in spacedrelationship to Description the Wall thereof. In this connection, thereflector member I I preferably is hollow and of metal, and As W111 beseen, In the dmWmg the mventlon constructed of a heat resistancematerial, such 40 is Particularly dlrected 9 the manufacture of ascopper rodium plated and finished with a brilimitation gems, Such asdlamonds and/or other liance which will present the sparkle to thecomprecious and semi-precious stones. In the method pleted It likewiseis to be understood that of making the gems. it W111 be noted t the thesaid metal reflector member H may be proshapes may be of Vanous Stylesand cuts t0 vided with interior and exterior facets, and may 45 latesquare cuts, emeralds, pear shape, marquisite, then be inserted in thedepression "5 and baguette and round- However for purposes of teredtherein with its facets in substantial regisdescription the illustrationas shown is for round tration with but Spaced from the facets of the outgems. depression, forcing the molten glass to fill the efe r now toFigures 4 to 6 inclusive the space outside the reflector member and thusform 50 m s sts of a plurality of pa united the stem shell 12 as shownin Figure 2. gether. In the specific embodiment shown in theSimultaneously with inserting the reflector drawing the gem preferablyis made of three member H to the interior of the stem shell 12, parts,each part having suitable facets formed is the introduction of the bodymaterial, unificathereon, as is usual in cut gems, with each of tionthereof with the stem shell, and shaping of 55 the exposed face withfacets. An exemplification of this is indicated in Figure 3 wherein theglass or other material to form the gem body I0 is introduced in suchplastic or semi molten state as to build up above the level of the die15 having depression l6. The material is thus built up over the top edgeof the reflector member H and unifies with the material, still plastic,forming stem shell !2. This unification is completed by pressure from anupper die which also acts to shape *the face and form the upper facets.

The gem resulting from the method outlined is accordingly and preferablya unified body and stem shell containing a reflector member in closecontact on the one side with the stem portion and on the other side withthe stem shell, The gem is provided with a faceted stem, the reflectormember is within the stem and is likewise faceted, preferably having itsfacets corresponding to the exterior facets of the stem portion. Thefact that the reflector member is thus not only embedded within the gemin close surface contact with the material forming the body of the gemand forming the shell, renders the presence of the reflector as suchinconspicuous, but on the other hand obtains a brillianoy of the gemboth from the upper face and when observing the stem, which closelysimulates a genuine gem.

There are other detail steps in the method and other detail differencesin the ultimate construction which will be deemed within the scope ofthe present invention, and as one such, attention is called to Figure'7. According to the shov ing of Figure 7 1 provide a preformed stemshell I 2', which, as in the herebefore described construction, may beof glass or other suitable material. This shell having substantial anduniform thickness and faceted inside and out. A gem body is providedhaving an exposed faceted portion Ill and a stem portion E3 the size,shape and facet of the stem portion i3 is such that it willsubstantially fit against the inside surface of the stem shell inintimate contact therewith throughout. In order to accommodate thethickness of the stem shell, the stem portion is made of less diameterat its end next the face portion 10 so that the facet portion willoverlie the upper edge of the stem shell as at M. The inside surface ofthe stem shell is preferably coated as at H with a suitable reflectingor shiny material, for instance mercury and the outsidelsurface of thestem portion I 3' is similarly coated with a reflecting or shinymaterial II, which also may be mercury or other suitable material ofwhich silver chronimum and the like are examples. The stem portion 13 isassembled within the stem shell 12 and the reflecting materials orcoating Ii and H" are then juxtaposed against each other. The thicknessof these coatings is substantially nothing more than a film and with theone coating supplementing the other, there will be increased reflectionand light to produce brilliancy in the gem whether observed from the topor from the stem. The film-like thickness of the reflecting materialthus makes it proper to state that the stem shell and stem portion ofthe body portion are in intimate association in the assembled gem. Theparts are held together by appropriate adhesive, and the gem will appearas being an integral gem closely simulating a genuine gem,

I claim:

An artificial gem comprising a stem portion, and a face portion, a stemshell shaped to surround the stem portion, said stem portion being ofless diameter than the face portion where joined, a reflector juxtaposedto the stem portion the diameter of its wider part being less than theface portion and stem shell and entirely surrounded by the said stemshell thereby presenting a reflecting surface to both the face portionand stem shell.

HARRIS I. NIRENSTEIN.

